diff --git a/requirements.txt b/requirements.txt
index 14ab03e..af5967b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-nltk==3.4.5
+nltk==3.9
 pkg-resources==0.0.0
 six==1.11.0
 textblob==0.15.0